20131322221 has 16 divisors (see below), whose sum is σ = 20892211200. Its totient is φ = 19377630000.

The previous prime is 20131322147. The next prime is 20131322227. The reversal of 20131322221 is 12222313102.

It is a cyclic number.

It is not a de Polignac number, because 20131322221 - 2⁷ = 20131322093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131322227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7927570 + ... + 7930108.

It is an arithmetic number, because the mean of its divisors is an integer number (1305763200).

Almost surely, 2^20131322221 is an apocalyptic number.

It is an amenable number.

20131322221 is a deficient number, since it is larger than the sum of its proper divisors (760888979).

20131322221 is a wasteful number, since it uses less digits than its factorization.

20131322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20131322221 its reverse (12222313102), we get a palindrome (32353635323).

The spelling of 20131322221 in words is "twenty billion, one hundred thirty-one million, three hundred twenty-two thousand, two hundred twenty-one".